This is the 1002nd most frequent Japanese word.
議論
Discussion or debate.
In this sentence, "議論" means to discuss or debate in a formal setting.
会議で新しいプロジェクトについて議論しました。
We discussed the new project in the meeting.
Here, "議論" is used to describe an intense or heated exchange of opinions or arguments.
彼らの議論は白熱してきた。
Their debate became intense.
In this instance, "議論" refers to the necessity of a discussion or debate on a particular issue.